Definately not engine out, maybe remove the intake pipe at most. It's just bolted to the ouside of the gearbox bellhousing facing the front of the car.
The black thingo with the orange bolt on it:
AFAIK no aftermarket alternative is avaliable through the usual outlets - they all have the wrong part number so I'd advise not bothering. Genuine nissan is the way to go in this case, I think it was $50-70 for a genuine nissan item.
Part number is 30620-80E21, which looks like it is superceeded by 30620-80E60 and 30620-80E61, which is then superceeded again by a part# I don't have
Just give them
30620-80E60 and they should be able to figure it out